store/retrieve objects in files

git-svn-id: svn://svn.open-ils.org/ILS/trunk@1887 dcc99617-32d9-48b4-a31d-7c20da2025e4

diff --git a/Open-ILS/xul/staff_client/chrome/content/evergreen/util/file.js b/Open-ILS/xul/staff_client/chrome/content/evergreen/util/file.js
new file mode 100644 (file)
index 0000000..9772657
--- /dev/null
+++ b/Open-ILS/xul/staff_client/chrome/content/evergreen/util/file.js
@@ -0,0 +1,140 @@
+dump('entering util/file.js\n');
+
+if (typeof util == 'undefined') util = {};
+util.file = function (mw,G,fname) {
+
+       this.mw = mw; this.G = G;
+
+       this.dirService = Components.classes["@mozilla.org/file/directory_service;1"].
+               getService( Components.interfaces.nsIProperties );
+
+       if (fname) this.get(fname);
+
+       return this;
+};
+
+util.file.prototype = {
+
+       'name' : '',
+       '_file' : null,
+       '_input_stream' : null,
+       '_output_stream' : null,
+
+       'get' : function( fname ) {
+               try {
+                       if (!fname) { fname = this.name; } else { this.name = fname; }
+                       if (!fname) throw('Must specify a filename.');
+
+                       this._file = this.dirService.get( "AChrom",  Components.interfaces.nsIFile );
+                       this._file.append(this.mw.myPackageDir); 
+                       this._file.append("content"); 
+                       this._file.append("conf"); 
+                       this._file.append(fname);
+       
+                       this.G.error.sdump('D_FILE',this._file.path);
+
+                       return this._file;
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file.get(): ' + E);
+                       throw(E);
+               }
+       },
+
+       'close' : function() {
+               try {
+                       if (!this._file) throw('Must .get() a file first.');
+                       if (this._input_stream) { this._input_stream.close(); this._input_stream = null; }
+                       if (this._output_stream) { this._output_stream.close(); this._output_stream = null; }
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file.close(): ' + E);
+                       throw(E);
+               }
+       },
+
+       'set_object' : function(obj) {
+               try {
+                       if (!this._file) throw('Must .get() a file first.');
+                       if (this._input_stream || this._output_stream) throw('Must .close() first.');
+                       if (!obj) throw('Must specify an object.');
+
+                       var obj_json; 
+                       try { obj_json = js2JSON( obj ); } catch(E) { throw('Could not JSONify the object: ' + E); }
+
+                       this._create_output_stream();
+                       this._output_stream.write( obj_json, String( obj_json ).length );
+                       this.close();
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file.set_object(): ' + E);
+                       throw(E);
+               }
+       },
+
+       'get_object' : function() {
+               try {
+                       if (!this._file) throw('Must .get() a file first.');
+                       if (!this._file.exists()) throw('File does not exist.');
+                       if (this._input_stream || this._output_stream) throw('Must .close() first.');
+                       
+                       this._create_input_stream();
+                       var data = this._input_stream(-1);
+                       this.close();
+       
+                       var obj; try { obj = JSON2js( data ); } catch(E) { throw('Could not js-ify the JSON: '+E); }
+       
+                       return obj;
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file.get_object(): ' + E);
+                       throw(E);
+               }
+       },
+
+       '_create_input_stream' : function() {
+               try {
+                       if (!this._file) throw('Must .get() a file first.');
+                       if (this._input_stream || this._output_stream) throw('Must .close() first.');
+                       if (!this._file.exists()) throw('File does not exist.');
+       
+                       var f = Components.classes["@mozilla.org/network/file-input-stream;1"]
+                               .createInstance(Components.interfaces.nsIFileInputStream);
+                       f.init(file, 0x01, 0, 0);
+                       this._input_stream = Components.classes["@mozilla.org/scriptableinputstream;1"]
+                               .createInstance(Components.interfaces.nsIScriptableInputStream);
+                       if (f) {
+                               this._input_stream.init(f);
+                               return this._input_stream;
+                       } else {
+                               throw('Could not instantiate input stream.');
+                       }
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file._create_input_stream(): ' + E);
+                       throw(E);
+               }
+       },
+
+       '_create_output_stream' : function() {
+               try {
+                       if (!this._file) throw('Must .get() a file first.');
+                       if (this._input_stream || this._output_stream) throw('Must .close() first.');
+
+                       if (! this._file.exists()) this._file.create( 0, 0640 );
+
+                       this._output_stream = Components.classes["@mozilla.org/network/file-output-stream;1"]
+                               .createInstance(Components.interfaces.nsIFileOutputStream);
+                       this._output_stream.init(this._file, 0x02 | 0x08 | 0x20, 0644, 0);
+
+                       return this._output_stream;
+
+               } catch(E) {
+                       this.G.error.sdump('D_ERROR','util.file._create_output_stream(): ' + E);
+                       throw(E);
+               }
+       }
+
+}
+
+dump('exiting util/file.js\n');